In the April 15 call obtained by NBC10.com on Monday, Charles Allen Jr. describes how the heavily-traveled 4,800-foot-long bridge crossing the Christina River in Wilmington had begun to separate and lean.

"It's kind of a crazy emergency," he said. "The two roadbeds are lifting up opposing each other, and it doesn't look right. Something's wrong."

Allen, who regularly travels across the bridge on his commute, told the operator that he had tried to contact the Delaware Department of Transportation using several numbers, but could not get in touch with anyone.

"I don't want to be rude and use this number for something that's not [an emergency], but it appears to be an emergency today," he said.

The operator told Allen that she would pass along the information to police. However, it's unclear what happened next with the man's warning.

The tilting wasn't addressed by transportation officials until June 2 -- more than six weeks later. That Monday, state transportation officials issued an emergency shut down of the bridge after a contractor, working on another project, noticed the bridge was leaning 2 feet to the side.

DelDOT officials eventually chose to close the bridge indefinitely. They said the decision was made out of an abundance of caution and to prevent a possible failure and collapse. Engineers are still working to determine what is causing the bridge's supports to tilt.

Allen's 911 call didn't come to light until after the man came forward following the closure.